From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 3409 invoked by alias); 19 Mar 2010 10:09:27 -0000 Received: (qmail 3350 invoked by alias); 19 Mar 2010 10:09:14 -0000 Date: Fri, 19 Mar 2010 10:09:00 -0000 Message-ID: <20100319100914.3349.qmail@sourceware.org> X-Bugzilla-Reason: CC References: Subject: [Bug tree-optimization/36439] [4.3 Regression] very long compile-time in PRE building gimp-plugin-registry In-Reply-To: Reply-To: gcc-bugzilla@gcc.gnu.org To: gcc-bugs@gcc.gnu.org From: "rguenther at suse dot de" Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Archive: List-Post: List-Help: Sender: gcc-bugs-owner@gcc.gnu.org X-SW-Source: 2010-03/txt/msg01827.txt.bz2 ------- Comment #14 from rguenther at suse dot de 2010-03-19 10:09 ------- Subject: Re: [4.3 Regression] very long compile-time in PRE building gimp-plugin-registry On Fri, 19 Mar 2010, kurt at garloff dot de wrote: > ------- Comment #11 from kurt at garloff dot de 2010-03-19 00:34 ------- > (In reply to comment #10) > > GCC 4.3.4 is being released, adjusting target milestone. > > Very non-scientific benchmark: > Did compile latest gmic-1.3.4.0 on a 2xL5540 system (plenty of RAM) with make > -j8 and compile flags: > -O3 --param max-inline-insns-auto=200 -ffast-math -funroll-loops > -ftree-vectorize > Times (in seconds, user, elapsed): > 4.3.5: 1263u, 377e > w/ -fno-tree-pre: 755u, 202e > 4.4.4: 1022u, 311e > w/ -fno-tree-pre: 996u, 284e > 4.5.0: 2325u, 615e > w/ -fno-tree-pre: 1974u, 543e > > Note that this is in contrast to earlier observations that 4.4/4.5 did do much > better than 4.3. Don't know whether that's caused by changed gmic code or > whether we have regressed in 4.5. Let me know if you want me to pick one file > that takes particularly long to compile and investigate further. This bug was about PRE causing compile-time issues at -O2 which is what was investigated and fixed for the testcases attached to this PR. I see, for -O2 and the CImg.C testcase (just using openSUSE packages from devel:gcc): 4.3.4 (r152973): stopped after 4min 4.4.2 (r155966): 68s 4.5.0 (r157384): 74s also see PR43415 for a similar problem where I am about to commit a patch. If you can provide a testcase for plain -O3 [-ffast-math -funroll-loops] being slow it would be appropriate to open a new bugreport for it. Thanks, Richard. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36439